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M2 wave buoy daily means for Nov 2011

Daily means from the M2 wave buoy for Nov 2011, including available wave height, period, direction, wind and sea temperature data.

Last observation shown

Data available:  to 

Monthly means for

Latest

Period Summary

Programmatically generated summary. Hog Says

655 wave-buoy observations covered all 30 days. Typical wave height was 5.3 ft (10th–90th percentile 2.3–9.2 ft), while mean peak wave period was 6.6 seconds (10th–90th percentile 4.3–9.3 seconds). Mean water temperature was 13.7°C (10th–90th percentile 13.3–14°C). 5 of 2,793 checked values (0.2%) were excluded by quality control. Across 1 comparable year, mean wave height was above the same-month mean of 5.2 ft and mean wave period was above the same-month mean of 6 seconds.

Generated only from the observations and comparisons shown on this page.

Typical Significant Wave Height

5.3ft
Mean: 5.7 ft
P10–P90: 2.3 — 9.2 ft
Recorded extremes

0.5 — 17.2 ft

Available for 648 of 655 hourly samples

Mean Observed Wave Period

6.6secs
P10–P90: 4.3 — 9.3secs
Recorded extremes

2.7 — 13.5secs

Available for 651 of 655 hourly samples

Typical Observed Wind

SW, -mph
Mean: - mph
P10–P90: - — - mph

Circular concentration: 86%

Available for 0 of 655 hourly samples

Mean Water Temperature

13.7°C
P10–P90: 13.3 — 14°C
Recorded extremes

13.1 — 14°C

Compared With Previous Novembers

Historical baseline from 709 observations across 1 year.

Wave Height
5.7ft
0.5ft above mean
Historical mean 5.184ft
Wave Period
6.6s
0.6s above mean
Historical mean 6s
Water Temperature
13.7°C
0.7°C above mean
Historical mean 13°C

Chart showing grouped wave observations for M2. Use the table on this page for a text version of the same measurements. To open hourly observations, use a linked day name in the table.

About M2 wave buoy

M2 (WMO 62091) is part of the Irish Marine Data Buoy Observation Network, managed by the Marine Institute in collaboration with Met Éireann. Moored in the Irish Sea east of Ireland, it provides open-water context for the busy, relatively enclosed waters between the Irish and British coasts.

Its current data source reports wave height, wave period, wave direction, directional spread, wind conditions and sea temperature.

Metrics are rows; days run left to right.
M2 wave buoy daily means Nov 2011Last observation shown
Metric
Mean significant wave height (ft)4973211364755644896434696777119
Mean maximum wave height (ft)513115311595118786611148546101291110101614
Mean peak period (s)778955656669677578765567776687
Mean zero-crossing period (s)455544445455555456544456555566
Mean peak wave directionSconcentration 93%Sconcentration 99%Sconcentration 98%Sconcentration 98%Wconcentration 49%Nconcentration 34%SEconcentration 57%Econcentration 80%Sconcentration 99%Sconcentration 96%SEconcentration 83%Sconcentration 96%Econcentration 87%Econcentration 78%Econcentration 73%SEconcentration 73%Sconcentration 98%Sconcentration 99%Sconcentration 100%Sconcentration 99%Sconcentration 98%NNWconcentration 95%Sconcentration 100%Sconcentration 100%SSWconcentration 75%Sconcentration 98%WSWconcentration 69%SSWconcentration 97%SSWconcentration 90%Sconcentration 99%
Mean wave directionSconcentration 99%Sconcentration 99%Sconcentration 100%Sconcentration 99%Wconcentration 71%NNEconcentration 36%SEconcentration 82%ESEconcentration 90%SSEconcentration 99%Sconcentration 99%SEconcentration 89%Sconcentration 99%ESEconcentration 93%ESEconcentration 95%ESEconcentration 94%SEconcentration 88%Sconcentration 100%Sconcentration 100%Sconcentration 99%Sconcentration 99%Sconcentration 99%NNWconcentration 98%Sconcentration 100%Sconcentration 100%SWconcentration 92%SSWconcentration 100%WSWconcentration 81%SSWconcentration 99%SSWconcentration 94%SSWconcentration 99%
Mean directional spread (°)25.421.824.526.625.939.132.429.421.426.430.427.831.132.027.134.621.820.019.621.928.822.917.419.631.824.232.822.723.019.6
Mean wind direction---------------------NWconcentration 100%SSWconcentration 99%SSWconcentration 95%WSWconcentration 95%SWconcentration 98%Wconcentration 92%SSWconcentration 97%SWconcentration 81%SSWconcentration 97%
Mean wind speed (mph)------------------------------
Mean water temperature(°C)13.914.014.014.013.913.913.813.713.713.713.813.813.813.913.813.713.713.813.713.713.713.713.613.613.513.513.313.213.213.2

Swipe sideways to see more days.

Wave metric colour key

Colours move through the scale as each number increases. They do not by themselves mean that conditions are good, safe or suitable for you.

Wave & swell height0–40+ ft
Wave & swell period0–22+ s
Wind speed0–75 mph

The displayed numbers remain the source of truth; colour is an additional visual cue.

What does buoy wave power mean?

kW/m means kilowatts of wave power per metre of wave crest. It describes the rate at which the observed sea state carries energy past the buoy.

Unlike the shore-directed forecast value, buoy wave power is the total power at the observation point. It is not projected towards a particular beach and does not predict breaking wave height.

In deep water, wave power can be calculated with:

P is approximately 0.49 times significant wave height squared times wave energy period.

P is power in kW/m, Hs is significant wave height in metres, and Te is wave energy period in seconds.

  • Provider-reported power is used when available.
  • Otherwise, a value is calculated only when both significant height and a genuine energy period are available. The ≈ symbol marks calculated values.
  • A dash is shown instead of substituting peak, Tm02, zero-crossing or other period measurements.
  • Daily and monthly figures use the mean of hourly-normalized observation power values; they are not calculated from mean height and period.

Wave direction, spectrum, water depth and local bathymetry still matter. Wave power is best read alongside height, period and direction rather than as a standalone surf-quality score.

The observation data displayed on this page is from the Met Éireann Irish Marine Data Buoy Observation Network.

Learn how SurfHog combines, checks and summarizes observations in the data and methodology notes.

› Wave Buoy List